As the lights dimmed, about 2,000 rowdy fans, mostly women in their 20s and 30s, howled at a decibel suited to a Beyoncé set at Coachella. But they weren’t going gaga for a pop deity. Calling themselves Murderinos, they came to hear expletive-laden tales of serial killings and brutal homicides told by Georgia Hardstark and Karen Kilgariff, the irreverent hosts of the wildly popular true-crime comedy podcast “My Favorite Murder.”

Standing on an empty stage, save for a small table with two bottles of water, Ms. Hardstark and Ms. Kilgariff sailed through the show’s breezy formula: Come for the frank and funny retellings of their “favorite” murder (today’s topic: the Los Feliz Murder Mansion from 1959), stay for the chatty non sequiturs (day drinking and Oregon cults).

“The common urban legend is that a father killed his whole family and himself on Christmas Eve in the 1950s. And that the house sat abandoned and nothing in the house had been touched or changed since that night,” Ms. Hardstark said.

Ms. Kilgariff jumped in. “Does anyone talk about the level of dust that would be on those things?” she said.

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Fans of the podcast, who call themselves "Muderinos," took selfies outside the theater.CreditEmily Berl for The New York Times

“It’s like abandonment porn,” Ms. Hardstark said.

“Yes, lots of people here are into abandonment porn,” Ms. Kilgariff said in her characteristic droll tone, which ignited loud giggles from the audience.

“Me, too,” Ms. Hardstark said.

“It’s second only to changing-room-shame porn,” Ms. Kilgariff said, before being drowned out by another round of deafening laughter.

The sold-out gig at the Orpheum in March was the halfway point of an 18-date international tour that kicked off in Las Vegas in January and wraps up next month in Glasgow. For the last two years, “My Favorite Murder” has been a permanent fixture atop the iTunes podcast charts, drawing up to 19 million listeners a month.

Why Murder, and Why Now?

In many ways, the subversive charm of “MFM,” as die-hards abbreviate it, is today’s answer to riot grrrl, the D.I.Y. feminist punk movement of the 1990s. There is a Facebook fan page with 200,000 members and spinoff groups, including “Meowderinos” (for cat-loving fans) and “button bashes” (for pun-happy pin collectors) that meet in all 50 states, as well as throughout Britain and Australia.

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Andrea Whitecotton, left, and Serena Whitecotton wore homemade fan dresses. CreditEmily Berl for The New York Times

“We as women have long felt we had to be cheerful and avoid heavy topics,” said Kendra Granniss, 28, a community support specialist from Brooklyn, who last year started “Murderinos and Mimosas,” a Meetup.com brunch with a dozen like-minded girlfriends. “Then came these two normal women, you know, just talking about murder. It was like, ‘Oh, we can talk about this and embrace the darker regions.’”

The hosts are starting to play catch up with their newfound celebrity. Earlier this spring, they started a $39.99 membership program that includes T-shirts, message boards and other V.I.P. goodies, and will publish an “autobiographical self-help book” later this year. A second tour begins in September that will include a Halloween show at the Microsoft Theater in Los Angeles, which holds more than 7,000.

Hollywood has also come knocking. Ms. Hardstark and Ms. Kilgariff have voiced characters for the Cartoon Network series “Craig of the Creek,” and in January, Ms. Hardstark appeared in an episode of ABC’s “Fresh Off the Boat.”

“The sky is the limit here,” said Joseph Schwartz, an agent at United Talent Agency who represents the show. “Podcasters have an incredibly powerful bond with their listeners and can galvanize their audience unlike any other entertainers.”

Fascinated With Death

The day after their hometown performance, Ms. Kilgariff, 48, and Ms. Hardstark, 37, were decompressing on a well-worn couch in Ms. Hardstark’s duplex apartment in East Hollywood. A small room on the upper floor, furnished with cross-stitches and other Etsy crafts sent from fans, doubles as a makeshift studio where they record their weekly podcast.

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The 2000-seat theater was sold out.CreditEmily Berl for The New York Times

“Even ‘victim’ can be such a throwaway word because it implies they didn’t have a family or life,” Ms. Hardstark said, as she petted one of her three cats. “There’s no reason this couldn’t be any of us.”

Part of the show’s appeal is the way it oscillates between loquacious sympathy and blunt wisecracks. There’s also the rubbernecking details from the murders themselves. In Episode 114, which aired last March, about the Hillside Stranglers, a pair of bloodthirsty cousins who petrified Los Angeles in the late 1970s, Ms. Kilgariff recites some of the gory evidence:

On Nov. 20, 1977, a 9-year-old boy finds the bodies of two girls in a trash heap on a hillside near Dodgers Stadium — it’s so horrible — 12-year-old Dolly Cepeda and 14-year-old Sonja Johnson … The bodies when they were found — it had been a week later — said they were decomposed, but the police could still tell they had been strangled and raped.

One of Ms. Kilgariff's quips has been turned into a marketable catchphrase.CreditEmily Berl for The New York Times

There is a scientific explanation behind the show’s success. A study published in 2010 in the research journal Social Psychological and Personality Science found that women use “tales of rape, murder and serial killers” as a way to process the dark persistence of misogynistic violence in society at large.

Some academics worry that the podcast’s popularity perpetuates skewed narratives about victimhood. “True crime is really more of a fantasy genre,” said Jean Murley, an associate professor of English at Queensborough Community College in New York, who wrote a book about the public’s curiosity with criminals. “This cavalier attitude that young, pretty white women are at great risk of being killed all the time just produces misplaced fear and anxiety.”

It’s not all scare tactics, however. Despite, or maybe because of, the grisly subject matter, Ms. Hardstark and Ms. Kilgariff talk freely about their personal lives, like friends at Sunday brunch.

Ms. Hardstark has been frank about her anxiety and depression, and Ms. Kilgariff has talked about her mother’s death from Alzheimer’s disease. They frequently mention that they see a joint therapist (in addition to attending one-on-one sessions).

“We’re both from California rural families where talking about mental health was second nature and not something to be ashamed of,” Ms. Hardstark said. “In the same way people don’t talk about murders a whole lot, people don’t talk about how hard the struggle is to live a happy life.”

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Ms. Kilgariff, right, and Ms. Hardstark, left, pose with Carolina Perez, a fan from Culver City, Calif.CreditEmily Berl for The New York Times

Fittingly, both women offer psychoanalytic explanations for their lifelong fascination with the macabre. Growing up in Irvine, Calif., in the 1980s, Ms. Hardstark said she was struck by how the women Ted Bundy kidnapped looked like her mother. Ms. Kilgariff, who grew up about seven hours away by car in Petaluma, Calif., said her mother, a psychiatric nurse, used to diagnose the mental disorders of strangers they passed on the street as a kind of game.

After dropping out of community college, Ms. Kilgariff went on to become a television writer, with credits on “Baskets” and “Portlandia,” while Ms. Hardstark ended up as a quirky Cooking Channel host known for concocting “the McNuggetini,” a vodka cocktail with a ketchup rim and chicken tender garnish.

Although they ran in similar social circles, it wasn’t until a 2015 Halloween party that they discovered their shared passion. Ms. Kilgariff, who was dressed as a scrub nurse, was recounting a gruesome car accident at South by Southwest, where a car plowed into a crowd and killed four.

“Everyone just started walking away horrified,” she said. But Ms. Hardstark, who was dressed as the musician Glenn Danzig, wanted to hear every last gory detail. A month later, over a five-hour lunch, the idea for “My Favorite Murder” was born.

“We’re just having conversations about people who got murdered,” Ms. Kilgariff said, before gulping down her last sip of coffee at their home studio.

Ms. Hardstark looked over at her co-host affectionately. “The only way we know how to deal with the horrors of life is through humor,” she said.